TKR1711X – BLOK 21aP .21 Competition Truggy Engine (Not Broken-In) TEKNO

Manufactured to the highest standards of precision in Japan, the BLOK 21aP engine provides increased power and excellent fuel mileage required by 1/8th scale offroad truggies.  Features include a long-stroke piston and sleeve design, DLC coated crankshaft, three-needle carburetor, and an efficient cooling head. The P (21j) carburetor produces awesome power with the mileage you’d expect from a top-of-the-line engine and comes with 6.5 and 7.0mm venturi.

Detailed Specs

• Displacement: 3.49 cc/ 0.213 cu.in
• Bore: 16.27 mm / 0.641 in
• Stroke: 16.8 mm / 0.661 in
• Output: 2.55 ps / 2.59 hp @33,000 r.p.m
• Practical R.P.M: 4,000~40,000 r.p.m
• Weight: 362 g / 12.77 oz.

Recommended Exhaust Pipe

• OS 2090

Recommended Glow Plug

• OS P3

Engine Warranty

• Tekno RC guarantees this item to be free of defects in materials and workmanship for up to 90 days from the original purchase date. Before the engine is run or installed, perform a thorough visual inspection, and contact our customer support immediately if anything abnormal is noticed. Warranty will be void if the engine shows any sign of use, disassembly, or modification(s). Tekno RC reserves the right to repair or replace any defective item. This item is not eligible for our general warranty program.

Not Broken-In

Want to do the break-in yourself? Now you can! This engine is untouched from the factory so you can perform your favorite break-in process.

We recommend idling at least two tanks through the engine with the needles fat while keeping the head temp at 200°F. Then while keeping the throttle below 50% max, run the car in a parking lot or on a flat surface for about five tanks. Then gradually increase the throttle endpoint and lean the engine until you get to about ten tanks. Always finish the break-in process on the track and be careful to not race the engine until the mechanical pinch is almost gone.

Break-in Tips

• Always preheat the engine to 200°F before starting.
• The engine tune should be fat for the majority of the process. This extra fuel is used to increase the lubrication and flush particles out of the engine. Because it’s fat, you will need to constantly monitor the temperature and make sure it is between 200 and 250°F the entire time.
• Stop the engine between each tank of fuel and make sure the piston is at bottom-dead-center. Let the engine cool to ambient temperature before preheating the engine head to 200°F and starting the next tank.
• Be sure to run 3/4 to a full gallon through the engine before racing.

Keeping a heat gun on the engine cooling head for too long can cause the paint to flake off. Recommend moving the heat gun between both sides of the block and head to evenly heat the block to 180f and the head to 200f before starting.